Drawing pkess



July 28 1936. A. A. BYERLEIN- DRAWING PRESS Original Fil ed Dec. 21,1927 7 Sheets-Shgaet l INVENTORI n; M Md 7w!) ATTORNEYS.

July 28, 1936.

A. A. BYERLEIN Re. 20,042

DRAWING PRESS Origifial Filed Dec. 2l, 1927 7 Sheets-Sheet 2' INVENTOR.

Mali BY, I 7

ATTORNEYS.

July 28, 1936. A. A. BYERLEIN 20,042

- I [DRAWING PRESS Original Filed Dec. 21, 1927 '7 Sheets-Sheet 4INVENTODR.

'I-1 1-- Maj/Q5 BY m a ez mw ATTORNEYS.

July 28, 1936. BYERLEIN Re. 20,042

DRAWING PRESS Original Filed Dec. 21, 1927 7 Sheets-Sheet 5 III/II/IIIIMI Jg- 5- INVENTOR. Mum/4% BY W 200 A TTORNEYS.

July 28, 1936. A. A BYERLEIN DRAWING PRES 5 Original, Filed Dec. 21,1927 7 Sheets-Sheet 6 INVENTOR. M4 57 BY I A TTOR NEYS.

A. BYERLEIN Re. 20,042

DRAWING PRESS July 28, 1936.

Original Filed Dec. 21, 192'? 7Sheets-Sheet T A TTORNEY I Reissues] July28, 1936 UNITED" STATES DRAWIN G PRE S S Arthur A. Byerlein, Detroit,Mich., assignor, by

mesne assignments, to General Machinery Corporation, Hamilton, DelawareOhio, a corporation of Original No. 1,268,503, dated June 24, 1930,Serial No. 241,547, December 21, 1927.

Application for reissue June 10, 1936, Serial No. 84,581

34 Claims.

This invention relates to presses and particularly to that type of pressused in drawing metal.

One of the principal objects of the present invention is to provide apress of this character having a plurality of blank holders, one ofwhich is operable as a drawing member, both blank holders being operatedby mechanism which is located at the same side of the press-bed.

Another object of the invention is the provision of a drawing presshaving three slide members mounted one within the other, all movabletoward the work or blank in the same direction, at least one of theslide members being operable with a dwell in its movement so as to serveas a blank holder.

A further object of the invention is the provision of a press having twoplungers operable toward the work or blank from opposite sides thereof,rotatable operating shafts being provided at opposite sides of thepress-bed for driving the two plungers.

Still another object is the provision of a press having three relativelymovable slide members operably connected to a common crank-shaft,with-the operating connections all at'the same side of the press-bed.

Other objects and advantages of the invention will be apparent from thefollowing description and the accompanying drawings in which Fig. 1 is aside elevation of a drawing press embodying the present invention;

Fig. 2 is a front elevation thereof showing the portion of the pressabove the press-bed;

Fig. 3 is a front elevation of the press, partly in vertical section,showing the portion of the press below the press-bed;

Fig. 4 is a side elevation showing the portion of the press below thepress-bed partly in section:

Fig. 5 is a central section on the line 5-5 of Fig. 2 showing theactuating mechanism-for the outside blank holder with the latter in itslowered position;

- Fig. 6 is a section on the line 6-45 of Fig. 5;

, Fig. 7 is a section on the line l-'l of Fig. 6; Fig. 8 is a section onthe line 8-8 of Fig. 5; Figs. 9 and 10 are diagrammatic views of certainlinkages;

Fig. 11 is a diagrammatic showing of the travel of the various slidemembers of the press;

Fig. 12 is a plan view of the bed of the press;

Fig. 13 is a bottom plan view of the three slide members of the press;

Fig. 14 is a horizontal section on the line |4--| 4 of Fig. 1 throughthe end of one of the rockshafts of the press; and

Fig. 15 is a section on the line Iii-l5 of Fig. 14.

Referring to the figures more particularly by reference numerals l0designates the frame of the press which comprises a bed spaced apartuprights or side frames I2 carrying the actuating mechanism and guidingthe outer blank holder for vertical reciprocatory movement, and an archmember l3 which interconnects the two side frames. The outside blankholder H is guided upon guides I5 upon the side frames l2'oi the 10press.

Means for reciprocating the outside blank holder M in its guides l5comprises a toggle mechanism consisting of front and rear togglerockshafts 20 and 2| extending transversely of the press and journaledin bearings 22 at the ends of the rock-shafts and additional bearings 23provided in the two depending walls 24 which form a part of the archmember l3. The rockshafts 20 and 2| are provided with integral arms 2926 between the bearings 22 and 23 near the outer ends of therock-shafts, the'outer ends of these arms being connected to the upperends of links 2], the lower ends of these links being pivotallyconnected to ears I68 on the outside blank holder 5 e H adjacent thefour corners thereof. The rockshafts together with the arms 26 and thelinks 21 constitute toggles forreciprocating the blank holder, it beingapparent that rotation of the rock-shafts 20 and 2| in oppositedirections re- 3 sults in either raising or lowering the blank holder I4and since all the corresponding parts move simultaneously and throughequal distances the blank holder is raised or lowered, without tiltingor binding, and an even pressure is obtained 35 upon the work or blankwhen this blank holder is in the lowered position.

The rock-shafts 20 and 2| are actuated from a rotatable actuating shaftor crank-shaft 30 journaled in the side frames and extending trans- 4versely of the press and centrally positioned between the rock-shaftsand situated in the central vertical plane of the press. Such actuatingmechanism includes as one of its principal elements a slide-actuatingmember 3| which is connected with the rock-shafts 20 and 2| to actuatethe same, and which is itself actuated from the crank-shaft 30: Theslide-actuating member 3| is supported between the rock-shafts 20 and 2|within a slide housing 32 which guides the slideactuating member forreciprocatory movement along an obliquely disposedline extending fromfront to rear of the press, the line of movement passing above the frontrock-shaft 20 and below the rear rock-shaft 2|, the normal distancesbetween the line 01. movement and the two rockshafts being equal. Thisarrangement is bestillustrated in Fig. 5. The slide housing 32 is anelongated tubular member preferably of rectangular cross-section and isrigidly secured to the arch member |3 of the press which is cast with anobliquely disposed opening 33 in the mid plane of the press to receivethe slide housing 32.

Referring particularly to Figs. 5 to 10, the crank-shaft 30 is providedwith a crank 35, preferably in the mid plane of the press, which crankis connected by a connecting rod 38 with a segmental shaped rock lever31 pivotally mounted upon pin 38 which is fixed in a lug 39 forming apart of the arch of the press frame. Rocking lever 31 is connected by alink 40 to a second rocking lever 4| which is mounted on pin 42 which,like pin 38, is immovably fixed in the part 39 of the arch. The rockinglever 4| is pivotally connected at its other end with a link 43 which isconnected to the pin 45 of the bifurcated rocking lever 4|. The otherend of link 43 is rotatably connected to the center of a pin 50 which inturn is keyed to a bifurcated link 51. Link 51 connects through link-pin58 with the rear end of the slide-actuating member 3|.

The motion is transmitted from the slide-actuating member 3| to the reartoggle rock-shaft 2| through the following connections." The pin 58,which is fixed in the member 3|, carries the ends of two links 59 whichare bent so as to en- 'close the outer end portions of the pin 5|]. In-

stead of engaging the pin 50 directly, however, the links 59 areconnected through bushings 6| which are rotatable in the forked arms 55of the toggle rock-shaft 2!. The ends of the link-pin 5|]. are providedwith a pair of flat parallel surfaces 5| adapted to be received betweencooperating parallel flat surfaces 53 upon the interior of bushings 6|.The bushings are constructed to have a close sliding fit with thesurfaces of the link-pin 50 and some little clearance space is providedat 54 to permit some relative motion of the pin and bushing at rightangles to the axis of the pin. Since the pin is keyed to the link 51with the fiat surfaces 5| parallel to the longitudinal axis of thatlink, it is apparent that the bushings are constrained to movement uponpin 58 in a direction parallel with the longitudinal axis of the link51. The rear end of the slide-actuating member 3| is thus connected withthe toggle rock-shaft 2| through links 59, bushings GI, and arms 55, andbecause of the sliding connection between the pin 50 and bushings 6|there is a certain independence of movement betweenthe main linkagewhich drives the slide-actuating member 3|, and the linkage by which theslideactuating member is connected to the rock-shaft 2|. The connectionsto the actuating-slide member 3| and to the rock-shaft 2| are shown byFigs. 9- and 10 diagrammatically. In Fig. 10, which corresponds to theposition of the partsshown in Fig. 5, the linkages are shown for a downposition of the blank holder l4, and in Fig. 9 corresponding to a raisedposition of this blank holder. In these diagrammatic views, the mainlinkage -for actuating the slide-actuating member 3| from thecrank-shaft 30 is shown by the sectioned parts, and the linkage foractuating the rockshaft 2| from the slide-actuating member is shown inoutline. It is evident from these figures and from Figs. 6, 7 and 8 thatthe link-pin 50 is free to slide in the bushing 8| and to take aposition therein depending uponthe running clearance which may vary fromtime to time with the varying stresses and wear of the various parts.

The forward end of the slide-actuating member 3| is connected with thefront rock-shaft 20 to drive the latter by a mechanism which consists ofa link-pin 41 carried by the slide-actuating member and a link 48pivoted thereon and pivotally connected at its other end with linkpin 49carried upon the outer end of the forked arm 63 extending from and rigidwith the front rock-shaft 20. v

The linkage between the slide-actuating member 3| and each of the togglerock-shafts 20 and 2| is such that the latter are actuated through equalangular distances thereby effecting parallel raising and loweringmovement of the blank holder |4 through its operation, and securing evenpressure of the blank holder upon the work. The power is transmittedthrough the toggle connections productive of a suspended dwell in themovements of the slide-actuating member 3| from the crank-shaft 30, andthe power divides equally at the slideactuating member and istransmitted through the two equal systems of transmission to the twotoggle rock-shafts 20 and 2| which are thus actuated with a considerabledwell in their movements. The power is then transmitted from the tworock-shafts to opposite sides of the blank holder l4 and the blankholder is thus caused to reciprocate with a dwell of, say, as shown bycurve A of Fig. 11. The power transmission for actuating the blankholder I4 is symmetrical with respect to the center of the press andfrom the center of the crank-shaft, and objectionable vibrations andunbalanced strains on the press parts are thus obviated.

The crank-shaft 36, as previously mentioned is mounted in bearings inthe side frame members I2 and is also rotatably mounted in auxiliarybearings 66 and 61 in the walls 24. Between the two bearings 55 and B1and the bearings in the frame portions l2 and equidistantly spaced fromthe center of the crank-shaft 30 are crank-arms 6B and 69 which areconnected at their ends to two connecting rods 10, which are pivoted attheir lower ends to the central portions of an inner slide member orplunger 12, the connecting rods being provided with the usuallength-adjusting devices customarily employed in plunger connections.This plunger 12 is guided for vertical reciprocatory movement within anintermediate die slide member 14 which in turn is guided within theoutside blank holder M, as shown in Fig. 13. The intermediate slidemember 14, which is operable as a blank holder. and also as a drawingdie slide, is connected at its four corners to links 15 the upper endsof which are pivotally connected to arms 16 which as shown arepositioned closer to the center of the frame than the toggle links 21,by which the outside blank holder is operated. The arms 16 together withthe links 15 form toggles, the arms 16 being fixed to stub rockshafts18. The rock-shafts 18 are iournaled freely in the outer end of thetoggle rock-shafts 20 and 2|. As shown more clearly in Fig. 14 thetoggle rock-shafts 20 and 2| are hollow at their ends so as to rotatablymount the stub-shafts 18 concentrically therewith. The hub portion 8| ofeach toggle arm 15 is received in a socket portion 82 provided on theouter portion of each toggle rock-shaft 20, 2|, and the shortrock-shafts 18 are thus prevented from moving endwise within the maintoggle rock-shafts. The socket portions 82 as shown in Fig. 15 extendthe greater portion of the way around the main rock-shafts 20 and. 15

7 2|, but one side of the socket 82 is open to permit relativerotational movement of the toggle arm 8| and the transmission of powerfrom the rockshaft 18 to the toggle connection to the intermediate slidemember 14. Although both the toggle rock-shafts 20, 2I and the shortrockshafts 18 are rocked back and forth through a considerable angle,nevertheless, as both the main toggle rock-shafts 20, 2I and theadditional short shafts 18 operate in the same direction at the sametime through at least part of their movement in moving both theintermediate slide member 14 and the outside blank holder I4 downwardlyor upwardly, the socket members 82 may extend throughout a major portionof the circumferential extent of the main rock-shafts 20, 2i.

At the outer end of each short rock-shaft 18 is an arm 84 which ispivotally connected to a link which in turn is pivoted on pin 86provided in a slide 81 provided at one side of the press, acorresponding slide 88 being provided at the opposite side of the press.The two slides 81 and 88 are vertically guided for reciprocatorymovement in the slide guides 89 and located at the upper side portionsof the press and in the middle plane of the press in a forward andrearward direction. Each of these slides is pivotally connected by meansof a pin 9| to a connecting rod 92 which is pivoted at its lower end onpin 93 provided at the end of a crank-arm 94 on the main crank-shaft 30at the outer end thereof, it being understood that the powertransmissions at both ends of the crank-shaft 30 to the two slides .81and 88 are similar in their construction and symmetrically arranged onthe press. The four short stub-shafts 18 thus reciprocate theintermediate slide member 14 with a considerable dwell in its movementdue to the toggle connections between the short shafts 18 and the slide14 and also due to the connections between the arm 84 and thecrank-shaft.

The dwell in the movement of the intermediate slide member 14, as shownin Fig. 11 commences after the start .of the dwell in the outer blankholder I4, thev dwell of the intermediate slide member 14 beingindicated by the curve B in the figure referred to. The plunger or innerslide member 12 has a motion which is indicated by the curve C. FromFig. 11 it is apparent that in the operation of the machine, the outsideblank holder I4 first moves downwardly and then dwells in its movement.At the start of dwell in the movement of the outside blank holder,indicated by reference numeral 91 of curve A, the intermediate slidemember 14 continues to move downwardly and completes its travel to itsdown position through the space 98 during which opera tion the diecarried by this intermediate slide member operates as a drawing die tothus complete a first drawing operation on the metal before thisintermediate slide member pauses at the point 99- in its downwardmovement and dwells. At the start of dwell of the intermediate slidemember 14 the plunger 12 is moving downwardly and the plunger completesits movement through the space I00 and punches or draws the metal orblank while moving through this distance. During the eifective operationof the plunger the intermediate slide member may serve as a blankholder, as it'remains in engagement with the work and does not moveupwardly to release the work until after the plunger has started to moveaway from the work, this point being indicated at IN on curve C. Afterthe plunger die has started to move away from the work the inner slidemember and the outside blank holder reach the ends of their dwells andalso are disengaged from the work. By reason of a construction such asthis large stampings may be made in a single complete operation to -5provide an opening or a double draw in the metal, without necessitatingthe removal of the blank after one operation and again positioning thestamped metal in a second press to complete a second drawing or stampingoperation on the partially formed work.

The transmission of power from the crankshaft 30 to the plunger, theintermediate slide member 14 and the outer slide member I4 is'symmetrical with respect to the center of the crankshaft. The power ispreferablysupplied to the crank-shaft by means of two gears I04 and I05which are fixed to the crank-shaft 30 adjacentits ends and just insideof the crank-arms 94. The two gears I04 and I05 are driven throughpinions 20 I06, one provided at each end of a transverse drive-shaft I01which is in turn fixed to a driving gear I08. Gear I08 mesheswith apinion I09 fixed on shaft IIO extending across the press which alsocarries a wheel III. This wheel III 25 is driven by a belt II2 operatedby means of a motor II3 provided on a bracket II4 which is fastenedrigidly in place to an upper portion of the press. The bearings for theshafts I01 and H0 are provided in a bracket II5 which is at- 30 tachedrigidly in place to one side of the press frame.

The power-transmitting shaft H0 in addition to carrying the drive pinionI09 and wheel III is also rigidly attached to and drives a beveled 35drive-gear II8. Engaging the bevel gear H8 is a driven bevel gear II 9provided at the upper end of an upwardly extending shaft I20 at the rearside portion of the press. .The shaft I20 is mounted at its upper end ina bearing I2I which is fixed to the press frame. The lower end of theshaft I20 is mounted in a bearing I23 provided in a box or case I24 atone side of the press near the bed. Rigidly connected to the lower endof the shaft I20 is a beveled gear I25 which engages with a beveled gearI26 carried by shaft I21 journaled for rotation in bearings I28 providedat the rear of the press as shown. This shaft I21 is also provided witha drive spur-gear or pinion I29 which engages spur-gear I30 fixed on thetransverse shaft I 3| journaled at its ends in bearings I32. Shaft I3lcarries a pinion I33 which gears with the large spur-gear I34 providedat one side of the press on amain lower crank-shaft I35 which isjournaled in bearings I36 and auxiliary bearings I31 in a bottom housingI39, which is positioned below and fixed to the press-bed II byremovable tie rods I39 which are extensions of the main top tie rodsI40. the bottom housing being spaced from the bed by a spacing portionI. The crank-shaft I35 is located some distance below the press bed andcentrally below the crank-shaft 30 at the upper end of the press.Between the bearings on each side of the crank-shaft the latter isprovided with crankarms I 41 pivotally connected to connecting rods I42which in turn are pivotally connected by pins I 43 to a bottom slidemember or plunger I44. The connecting rods I42 are formed of telescopicsections I45 and I46 so that their lengths may be adjusted to adjust thelimits of movement of the bottom plunger I44, such an arrangement beingsimilar to the length adjusting connection by means of which the upperplunger 12 is operably connec ed to t e crank shaft 30.

Slidably mounted in the bed I I of the press and suitably guided thereinis a stripper slide I50 this slide being in the form of a hollow shellor box open at the lower end and guided for vertical reciprocatorymotion. This slide I50 guides the plunger I44 as by means of the guideways I5I provided in the slide I50 which extend into cor-' respondingguide slots in the plunger. The lower portion of the stripper slide I50is provided-at its four corners with the outstanding brackets I54 eachof which is fastened to the upper end of a piston-rod I55. In thepositions shown in Figs. 3 and 4, the stripper slide I50 and thepiston-rods I55 are at their upper limits of movement and the pistons,provided at the lower ends of the piston-rods I55, are adjacent upperportions of the four fluid cylinders I50 provided at the four corners ofthe bottom of. the press. These four cylinders contain fluid and act asa means for permitting the cushioned downward movement of the stripperslide I50 and as a means for returning this slide upwardly after thesame has been released. At the top of the stripper slide I50 are thethree cross-plates I58 extending from front to rear of the press andattached at their front and rear portions to the front and rear sides ofthe stripper slide I50. The cross-plates I58 move between strengthmembers I60 extending from front to rear of the press and removablysupported at their ends at front and rear portions of the press-bed in arigid manner. The top sides of these strength members I50 support theheavy bolster-plate I62 which may be rigidly attached to the press-bed,overlying the front and rear sides I63 and I54 of the press-bed. Theplunger I44 is provided with forwardly and rearwardly extending recessesor slots in which the strength members I50 may be received, and theuppermost limit of movement of the plunger I44 is such as to just clearthe lower sides of the beams I60. The lower ends of the beams 50 act asbumpers to limit the upward movement of the stripper slide I50, pins I6Ibeing provided between the beams I60 and the recessed portion of thestripper slide in which the beams I60 are received.

The plunger I44 may be operably connected to a plunger die as by meansof vertical pins projecting down through holes in the bolster-plate I62and through the cross-plates I58 of the stripper slide. The plunger thusvertically reciprocates the plunger die by means of these pins justmentioned. Outside of the plunger die, a stripper plate, shown in dottedlines in Fig. 3' at I65 may be employed to engage the lower side of thework or blank and cooperate with upper slide or slides in a drawingoperation or for the removal or disengagement of the work after it hasbeen formed. This stripper plate rests on pins I55 which extend downfreely through holes in the bolster plate and engage the top sides ofthe cross plates I58. When the blank holder I4, operated from the upperportion of the press, comes down and engages the work or blank whichrests on the stripper plate, the stripper plate is moved downwardlyuntil a bottom die, which may be rigidly held on the bolster-plate IE2is engaged with the work. During this downward movement of the stripperplate the cross-plates I58 of the stripper slide I50 force the stripperslide bodily downwardly in its guides in the bed and force the pistonsin the fluid system downwardly. After the engagement of the outer blankholder I 4 with the work on the bottom die theblank holder dwells in itsmovement and the intermediate top slide will be ineffective.

comes into action to draw or stamp the metal.

Both the top plunger and the bottom plunger may be used, or if desiredeither one or both of these plungers need not be provided with dies andThe two top slide members 5 I4 and 14 may be used at the same time orused singly with either the top plunger, the bottom plunger or bothaccording to the character of the work. By the provision of fivedifferent slides almost any character of work and combinations of diesmay be dealt with in a satisfactory manner but it is apparent that it isnot necessary to use all of the slides at any one time or for any onesetting of the press. The bottom plunger as shown in Fig. 11 is movabletowards the work or 15 blank at approximately the same time that the topplunger I2 moves toward the work, curve D in this figure indicating thecharacter of the movement of the lower plunger I44. This plunger may beused to stamp a hole in the partlyformed work or may be used as adrawingslide with or without the cooperation of a die held in the top plungerI2. After the dies held by the top slide members have started theirupward movement the stripper plate I65 frees the formed blank from thebottom dies and moves upwardly carrying the formed work with it.

While the form of apparatus herein described constitutes a. preferredembodiment of the invention, it is to be understood that the inventionis not limited to this precise form of apparatus, and that changes maybe made therein without departing from the scope of the invention whichis defined in the appended claims.

What is claimed is:

1. A drawing press having a frame, three movable die-slides provided insaid frame, a crankshaft rotatable in said frame, and three distinctdriven connections from said crank shaft for independently operating thethree slides, the three 40 slides all being movable to effectivepositions in the same direction relatively to the press.

2. A drawing press comprising a frame, a bed, and three movable dieslides mounted in said frame to move in the same direction away from thebed, toggle means for moving one of said slides with a dwell in itsmovement, toggle means for moving a second slide with a dwell in itsmovement and means for moving the third slide.

3. A press having more than two movable die slide members, a bed,operating means located at one side of the bed, and connections betweensaid means and three of said slide members, said connections being alllocated at the said one side of the bed.

4. A drawing press comprising a frame having a bed, a first die slidemember and a second die slide member provided in said frame, a rotatablecrank-shaft mounted in said frame, a crank connection from saidcrank-shaft direct to the first 7 slide member, and a connection fromthe crankshaft to the second slide member independent of said crankconnection, a third die slide member, means for operating said thirdslide member with a dwell in its movement, and a power shaft operablyconnected to said crank-shaft and to said operating means.

5. A drawing press comprising a frame, a bed, and three movable slidesmounted within them frame to move in the same direction away from thebed, toggle means for moving one of said slides with a dwell in itsmovement, toggle means for moving a second slide with a dwell in itsmovement. a power-operated crank-shaft. con- 75 nection from the ends ofsaid crank-shaft to one of said toggle means, a connection from theinner part of the shaft to the other toggle means,

and an additional connection from the inner part in said frame andhaving three independent,

driven connections for reciprocating all of said slide members.

7. In a drawing press, a frame, an outer slide member mounted in saidframe for reciprocatory movement, an intermediate slide member mountedin said outer slide member for reciprocatory movement, an inner slidemember mounted within the intermediate member for reciprocatorymovement, and means for reciprocating all of said slide members, saidmeans comprising a shaft rotatably mounted in said frame, a connectionfrom the center of said shaft to one of said slide members, a connectionfrom inner portions of said shaft spaced from the center thereof foroperating another of the slide members and a connection from the end ofsaid shaft for operating still another of the slide members.

8. A drawing press comprising a frame,'a bed and three nested slidext'embers slidable to positions at one side of the bed, a crank-shaftrotatably mounted in said frame, a direct crank connection between saidcrank-shaft and one of said slide members, a pair of spaced rock-shafts,a toggle connection between said crank-shaft and the rock-shafts, toggleconnections between the rock-shafts and one of the slide members,aciditional rock-shafts, connections between the crank-shaft and theadditional rock-shafts, and toggle connections between the additionalrockshafts and the other slide member.

9; In a drawing press, a frame, a plunger in said frame, and two nestedslide members operable with dwells in their movements, a crankshaftrotatably mounted in said frame, a pair of rock-shafts symmetricallyarranged in parallelism with the crank-shaft, driving connectionsbetween the crank-shaft and the rockshafts, means for rotating' 'sa idcrank-shaft, a direct driving connection from'the crank-shaft to theplunger, toggle connections between the rock-shafts and one of the slidemembers, additional rock-shafts symmetrically arranged in parallelismwith the crank-shaft, driving connections between the crank-shaft andthe additional rock-shafts, the various said driving connections beingsymmetrically connected to the crank-shaft, and means connecting saidadditional rock-shafts to the other of said slide members.

10. A drawing press comprising a frame, a bed, a crank-shaft in saidframe above the bed, a

plunger reciprocally mounted within said frame,

a crank connection between said crank-shaft and said plunger, a secondcrank-shaft in the frame in said frame, a shaft mounted in the frameabove the bed, a die slide adapted to recnprocate within said frame, anoperating connection between said slide and said shaft, a second shaftrotatably mounted in said frame below the bed,.

a second die slide adapted to reciprocate within said frame, anoperating connection between the second slide and the second shaft, ablank holder, a third die slide, operating mechanism for the blankholder, and operating mechanism for the third slide. 1

12. A drawing press comprising a frame, a bed,

a plunger adapted to reciprocate within said frame, a crank-shaftmounted in the frame above the bed, an operating. connection between thecrank-shaft and the plunger, a second crankshaft mounted in the framebelowthe bed, a second plunger adapted to reciprocate within said frame,an operating connection between the second plunger and the secondcrank-shaft, a slide member in which one of said plungers is slidablymounted, operating means including a toggle connection interconnectingsaid slide member and one of said crank-shafts, a second slide memberadapted to reciprocate within said frame, operating mechanism includinga toggle connection for driving the second slide member from one of thecrank-shafts, and means for driving both of said crank-shafts.

13. In a drawing press, a frame, a rotatable crank-shaft in the top of'the frame,- a second rotatable crank-shaft in the bottom of the frame, aplunger adapted to reciprocate within said frame and connected to eachcrank-shaft, a.

blank holder operably interconnected to one of said crank-shafts, commondriving means for both of said crank-shafts, said plungers beingoperable toward each other and away from each other during the inwardand outward strokes of the plungers respectively.

14. In a drawing press, a stationary bed, a frame in which said bed isprovided, a plurality of die slide members movable within said frame topositions above the bed, operating means therefor, an ejector member forejecting work upwardly away from the bed, a plunger movable away fromthe bed in a downward direction, and operating means for said plunger.

15. In adrawing press, a frame, an ejector member slidable in saidframe, a plunger slidable in said ejector member, operating means forsaid plunger located at one side of the vertical center of the press,and a plurality of nested slide members slidable within the frame at theopposite side of the press, and means for driving said slide memberswith dwells in their movements.

16. In a drawing press, a frame, two die slide members movable in theframe towards effective positions in the same direction relatively tothe press, a pair of toggle shafts in the frame, a crank-shaft in theframe, operating connection between the crank-shaft and the toggleshafts, toggle connections between the toggle shafts and one of theslide members, operating shafts concentric with said toggle shafts andprovided at both ends of the toggle shafts, operating means for saidoperating shafts, and toggle connections between said operating shaftsand the other slide member.

' 17. In the drawing press, a frame, a pair of die slides one mounted inthe frame and the other mounted in the first slide, a plunger adapted toreciprocate within said frame, a crank-shaft rotatably mounted in saidframe, a connection between the plunger and the crank-shaft, a rockshaftconnected to the crank-shaft, a toggle connection between the endportions of said rockshaft and one of said slides, operating shaftsconcentric with and mounted on said rock shaft, means for driving saidoperating shafts and a toggle connection between each of said operatingshafts and the other slide.

18. In a drawing press, a frame, a plurality of nested die slidesmounted for reciprocal move- ,ment in said frame, toggle systemsconnected to each of said slides, and operating means for said togglesystems comprising rock-shafts mounted coaxially and supported one uponanother for oscillatory movement. I

19. In a drawing press, a frame, a bed in the frame, a crank-shaftmounted in the frame, a plunger adapted to reciprocate within saidframe, a direct connection between the plunger and the crank-shaft, apair of spaced toggle shafts, means for operating said toggle shaftsfrom the crankshaft with dwells in their movements, a die slide adaptedto reciprocate within said frame, toggle connections between the toggleshafts and the die slide, a second die slide, toggle links for operatingsaid second die slide, and means for operating said toggle links saidmeans being mounted for oscillatory movements on the toggle shafts.

20. In a'drawing press, a frame, a die slide movable in said frame, adie slide movable within said first die slide, a pair of rock-shafts insaid frame, toggle connections from said rockshafts for operating one ofsaid slides, four individual rock-shafts, a toggle connection from eachof said individual rock-shafts to the other of said slides, and meansfor operating said rockshafts.

21. In a drawing press, a frame, a plurality of nested die slidesadapted to reciprocate within said frame, link means connected to one ofsaid slides, operating means for said link means comprising rock-shafts,journaled in said frame, a set of links connected to the other of saidslides, and additional rock-shafts connected to said set of links andmounted in alignment with said first named rock-shafts.

22. In a drawing press, a frame, a stationary be'd associated with saidframe, a drawing slide movable downwardly towards the bed, a stripperslide mounted in said frame and adapted to support a blank, means foryieldingly supportingsaid stripper slide, a die slide slidingly mountedadjacent said stripper slide and movable upwardly toward the blankposition, and mechanical means for positively operating said die slide.

23. In a press of the class described, a frame, a press bed in saidframe, a die slide movable in said frame, toggle links connected to saidslide for operating it with a dwell in its movements,

a second die slide, toggle links connected to said second slide foroperating it with a dwell in its movements independently of the'first'slide, and a drive means for operating all of said toggle links.

' 24. In a drawing press of the class described, a frame, a press bed insaid frame, a die slide movable in said frame, toggle links connected tosaid slide for operating it with a dwell in its movements, a second dieslide slidably mounted within said first named slide, toggle linksconnected to said second slide for operating it with a dwell in itsmovements independently of the first slide, and drive means for saidtoggle links.

25. In a drawing press of .the class described, a frame, a press bed insaid frame, a die slide movable in one direction in said frame, togglelinks connected to said slide for operating it with a dwell in itsmovements, a second die slide slidably mounted within said first namedslide and operable in the same direction, toggle links connected to saidsecond slide for operating it with a dwell in its movementsindependently of the first slide, a die slide mounted in said frame forreclprocatory movement in a direction counter to that of said first twoslides, and drive means for said toggle links and for said third dieslide.

26. In a drawing press of the class described, a. frame, a press bed insaid frame, a die slide movable in one direction in said frame, togglelinks connected to said slide for operating it with a dwell in itsmovements, 9, second die slide slidably mounted within said first namedslide and operable in the same direction, toggle links connected to saidsecond slide for operating it with a dwell in its movementsindependently of the first slide but with a conjoint period of dwell forsaid two slides, a die slide mounted in said frame for reciprocatorymovement in a direction counter to that of said first two slides, anddrive means for effecting sequence operation of said several togglelinks and connected slides and said third die slide whereby said thirddie slide performs its drawing movement within said period of conjointdwell.

27. In a drawing press of the class described, a

frame, a press bed in said frame, a die slide movable in one directionin said frame, means connected to said slide for operating it with adwell in its movements, said means including toggle links, a second dieslide slidably mounted within said first named slide and operable in thesame direction, means connected to said second slide for operating itwith a dwell in its movements independently of the first slide but witha conjoint period of dwell for said two slides, said means includingtogglelinks, a third die slide mounted in said frame for reciprocatorymovement in the direction counter to that of said first two slides, andmeans for effecting operation of said several die slides in timedrelation whereby said third die slide performs its drawing movementwithin said period of conjoint dwell.

28. In a drawing press of the class described,

.a frame, a press bed in said frame, a die slide I movable downwardly insaid frame towards said bed, means including toggle links connectedadiacent the four corners of said slide for operating it with a dwell inits movements so that said slide acts as a blank holder, a second dieslide slidably mounted within and movable in the same direction as saidfirst named slide, means including toggle links connected adjacent thefour corners of said second slide and operating it to draw in said firstnamed direction and then with a dwell in its movements independently ofthe first slide to act as a. second blank holder, a third die slideslidable in said press bed and operable in a direction counter to thatof said first two slides for effecting a drawing operation in saidopposite,.direction, means for operating said third die slide in saidopposite drawing operation and drive means for said several toggle linksand for said third die slide operating means for operating the same intimed relation ed in the lower part of said frame for movement in'adirection counter to the movement of said upper die slides, a pair ofoperating members symmetrically arranged in parallelism within the upperpart of said frame, means connecting said operating members to saidnested die slides and including toggle links, for effecting operation ofsaid first and second die slides each with a dwell in its movementsindependently of the other, an operating member within the lower part ofsaid frame, means for connecting said operating member to the die slidein the lower part of said frame for effecting movement thereof in adirection counterto the movement of the upper slides and in timedsequence with respect thereto, whereby said lower die slide efi'ects adrawing operation during a period of conjoint dwell of the upper dieslides, and means for causing operating movement of the severaloperating members.

30. In a drawing press of the character described, a frame, a press bedin said frame, a die slide movable in the upper part of said frame, asecond die slide slidably'mounted within said first named slide, a thirddie slide mounted in the lower part of said frame for movement in adirection counter to the movement of said upper die slides, operatingmembers symmetrically arranged in parallelism within the upper part ofsaid frame, means connecting said operating members to said nested dieslides and including toggle links, for effecting operation of saidnested die slides each with a dwell in its movements independently ofthe other, operating means within the lower part of said frame, meansfor connecting said operating means to the die slide in the lower-partof said frame for effecting movement thereof in a direction counter tothe movement of the upper slides and in timed sequence with respectthereto, whereby said lower die. slide effects a drawing operationduring a period of conjoint dwell of the upper die slides, driving meansfor said pair of operating shafts,

and driving interconnection therefrom to said lower operating means.

31. In a drawing press of the character described, a frame, a bed insaid frame, operating members mounted in the frame above said bed andincluding toggle links, a die slide adapted to reciprocate within saidframe, operating connection between said slide and said toggle links, asecond operating member mounted within said frame below the bed, asecond die slide adapted to reciprocate withinsaid frame in a directioncounter to the movement of said first named slide, said second die slidebeing operatively connected to said second operating member foretnecting a drawing operation, other operating members mounted withinthe upper portion of said frame and including toggle links, and a thirdslide slidably mounted within said first named slide and operativelyconnected to the toggle links of said last named operating members forreciprocation with independent dwell in the same direction as said firstnamed slide and means for effecting operation of said several slides intimed sequence, whereby the second slide effects a drawtions pivotallyconnected to said last mentioned ing operation while said first andthird slides dwell.

32. In a drawing press of the class described, a frame, a press bed insaid frame, a plurality of nested die slides adapted to reciprocatewith- 5 in said frame and one slidably mounted within the other, a setof toggle links connected to one of said slides, operating means forsaid links comprising rock members supported in said frame and journaledfor oscillatory rocking movements and having projecting arm portionspivotally connected to said links, a second set of toggle linksconnected to the other of said slides, additional rock members havingprojecting arm por- 5 toggle links and mounted in alignment with saidfirst named rock members, a third die slide mounted in said bed forreciprocatory movement and operable in a direction counter to both ofsaid nested die slides, and means for operating said toggle operatedslides and third die slide in timed relation, and said toggle operatedslides each with a dwell in its movements independently of the other.

33. In a drawing press of the character described, a frame, a press bedin said frame, three nested slides movably mounted within the upper partof said frame and one slidably mounted within the other, a die slidemounted in the lower part of said frame formovement in a directioncounter to the movement of said upper die slides, operating membersarranged within the upper part of said frame, means connectingsaidoperating members to two of said nested die slides and includingtoggle links, for effecting operation of said nested die slides withindependent dwells in their movements, means connecting the other ofsaid upper slides to said operating members for effecting operation intimed sequence with said toggle operated-slides, an operating memberwithin the lower part of said frame, means for connecting said loweroperating member to the die slide in the lower part of said frame foreflecting movement thereof in a direction counter to the movement of theupper slides and in timed sequence with respect thereto, whereby saidlower die slide effects a drawing operation during a period of conjointdwell of the toggle operatedupper slides, and means for causingoperating movement of the several operating members.

34. In a drawing press of the class described, a frame, a press bed insaid frame, a die slide movable in one direction in said frame, togglelinks connected to said slide for operating it with a dwell in itsmovements, a second die slide slidably mounted within said first namedslide and operable in the same direction, toggle links connected to saidsecond slide for operating it with a dwell in its movementsindependently of the first slide, a third die slide mounted in saidframe for reciprocatory movement in the same direction as said toggleoperated slides, a die slide mounted in said frame for reciprocatorymovement in a direction counter to that of said first three slides, anddrive means for said toggle links and for said other two die slides.

. ARTHUR A. BYERLEIN.

